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A full set of measurements of the Audio Research VT100 was made using its balanced inputs, with selected measurements repeated in the unbalanced mode, as noted below.

Following preconditioning/warm-up, the VT100 was very hot, though not hotter than the normally expected range for a tube amplifier. The Audio Research VT100's input impedance measured 178k ohms (98.9k ohms, unbalanced). The output impedance (at the 8 ohm taps) measured a maximum of 1.26 ohms at 20Hz and 1kHz, and 1.54 ohms at 20kHz. Voltage gain measured 23.8dB into 8 ohms (and an almost…

Wife: I read your draft reviews on the Futterman, Conrad Johnson, and Audio Research (footnote 2).

Husband: Ummmm.

Wife: If I were one of your readers, I'd think you missed a key point.

Husband: Urrmhm?

Wife: Doesn't the Berning 2100M cost less than half of all those other super amplifiers you are reviewing?

Husband: Umph.

Wife: Even if it wasn't the absolute best, wasn't the Berning 2100M directly competitive in most ways with amplifiers costing twice as much?…

Description: All-tube stereo power amplifier. Rated power: 100Wpc (20dBW). Frequency response: 20Hz–50kHz, +0/–3dB at full power.
Dimensions: 5¼" H × 19" W × 17¼" D. Weight: 40lb.
Price: $2995 (1984). No longer available (2021).
Manufacturer: The David Berning Company, 11007 Candlelight Lane, Potomac, MD 20854 (1984); 12430 McCrossin Lane, Potomac, MD 20854 (2021). Tel: (301) 926-3371. Web: davidberning.com.

In reality, "high-end audio" has nothing to do with price, features, or complexity. It simply describes a subset of music-reproduction components designed to convey the musical experience in the most realistic way possible—at any price level. A $500 integrated amplifier designed by sensitive engineers to sound…

The Anthem Integrated 1 couldn't be more different from the similarly priced Linn Majik-I integrated amplifier that I review…

Description: All-tube integrated amplifier. Tube complement: four 12AX7, one 12AT7, eight EL84. Inputs: four line, one tape loop, power amplifier in (all unbalanced on RCA jacks); phono input optional. Outputs: preamplifier out (line level, unbalanced), separate 4 ohm and 8 ohm loudspeaker terminals on 5-way binding posts. Power output: 25Wpc continuous into 4 or 8 ohms (14dBW/11dBW) with both channels driven from 30Hz to 15kHz at 1% THD. Frequency response: 15Hz–100kHz (–3dB) at rated power; 15Hz–150kHz (–3dB) at 1W. Signal/Noise ratio (ref. 25W): >83dB A-…

I auditioned the amplifiers in my new (and temporary) smaller listening room with two pair of loudspeakers: the Aerial 5 ($1295/pair) and Linn's $795/pair Tukan, both mounted on the Aerial stands. Loudspeaker cables were bi-wired MIT Terminator 2, or a bi-wired run of AudioQuest Midnight/Argent.

The analog source was a heavily modified Well Tempered Turntable and Lary Pederson–modified Well Tempered Arm fitted with an AudioQuest AQ7000nsx cartridge.

Digital front-end was a Sonic Frontiers SFCD-1 CD player feeding the amplifiers through a 1m run…

As you might expect from an amplifier with 12 tubes, the Integrated 1 ran very hot. The line input impedance measured 49k ohms, the phono impedance 30k ohms. Along with its lowish gain of 44dB, this mandates using a moving-magnet cartridge. Maximum voltage gain from the line input was a very high 33dB. Phono overload at 1kHz was high at 100mV. The Integrated 1's line stage and power-amplifer stage invert polarity; the phono stage does not. That means the Integrated 1 is inverting through the phono and line inputs when used as an integrated amplifier or…

Rex Hungerford, Edward DeVito, and Craig Bradley rode into town last week and, together with Audioquest's Garth Powell, solved all the electrical problems that have plagued my audio system for years.

Garth Powell, a name familiar to many Stereophile readers, is AudioQuest's electricity guru and designer of the Niagara series of power conditioners; he is also responsible for the company's line of AC and signal cables. Bradley is a local electrician and audio enthusiast who has done electrical work for me in the past, including…